/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.common.collect.testing.google;

import static com.google.common.collect.testing.IteratorFeature.MODIFIABLE;
import static com.google.common.collect.testing.IteratorFeature.UNMODIFIABLE;
import static com.google.common.collect.testing.features.CollectionFeature.KNOWN_ORDER;
import static com.google.common.collect.testing.features.CollectionFeature.SUPPORTS_ITERATOR_REMOVE;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.collect.testing.IteratorTester;
import com.google.common.collect.testing.features.CollectionFeature;

import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;

import org.junit.Ignore;

/**
 * Tester to make sure the {@code iterator().remove()} implementation of {@code Multiset} works when
 * there are multiple occurrences of elements.
 *
 * @author Louis Wasserman
 */
@GwtCompatible(emulated = true)
@Ignore // Affects only Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
public class MultisetIteratorTester<E> extends AbstractMultisetTester<E>
{
    @SuppressWarnings("unchecked")
    @CollectionFeature.Require({SUPPORTS_ITERATOR_REMOVE, KNOWN_ORDER})
    public void testRemovingIteratorKnownOrder()
    {
        new IteratorTester<E>(
                4,
                MODIFIABLE,
                getSubjectGenerator().order(Arrays.asList(e0(), e1(), e1(), e2())),
                IteratorTester.KnownOrder.KNOWN_ORDER)
        {
            @Override
            protected Iterator<E> newTargetIterator()
            {
                return getSubjectGenerator().create(e0(), e1(), e1(), e2()).iterator();
            }
        }.test();
    }

    @SuppressWarnings("unchecked")
    @CollectionFeature.Require(value = SUPPORTS_ITERATOR_REMOVE, absent = KNOWN_ORDER)
    public void testRemovingIteratorUnknownOrder()
    {
        new IteratorTester<E>(
                4,
                MODIFIABLE,
                Arrays.asList(e0(), e1(), e1(), e2()),
                IteratorTester.KnownOrder.UNKNOWN_ORDER)
        {
            @Override
            protected Iterator<E> newTargetIterator()
            {
                return getSubjectGenerator().create(e0(), e1(), e1(), e2()).iterator();
            }
        }.test();
    }

    @SuppressWarnings("unchecked")
    @CollectionFeature.Require(value = KNOWN_ORDER, absent = SUPPORTS_ITERATOR_REMOVE)
    public void testIteratorKnownOrder()
    {
        new IteratorTester<E>(
                4,
                UNMODIFIABLE,
                getSubjectGenerator().order(Arrays.asList(e0(), e1(), e1(), e2())),
                IteratorTester.KnownOrder.KNOWN_ORDER)
        {
            @Override
            protected Iterator<E> newTargetIterator()
            {
                return getSubjectGenerator().create(e0(), e1(), e1(), e2()).iterator();
            }
        }.test();
    }

    @SuppressWarnings("unchecked")
    @CollectionFeature.Require(absent = {SUPPORTS_ITERATOR_REMOVE, KNOWN_ORDER})
    public void testIteratorUnknownOrder()
    {
        new IteratorTester<E>(
                4,
                UNMODIFIABLE,
                Arrays.asList(e0(), e1(), e1(), e2()),
                IteratorTester.KnownOrder.UNKNOWN_ORDER)
        {
            @Override
            protected Iterator<E> newTargetIterator()
            {
                return getSubjectGenerator().create(e0(), e1(), e1(), e2()).iterator();
            }
        }.test();
    }

    /**
     * Returns {@link Method} instances for the tests that assume multisets support duplicates so that
     * the test of {@code Multisets.forSet()} can suppress them.
     */
    @GwtIncompatible // reflection
    public static List<Method> getIteratorDuplicateInitializingMethods()
    {
        return Arrays.asList(
                Helpers.getMethod(MultisetIteratorTester.class, "testIteratorKnownOrder"),
                Helpers.getMethod(MultisetIteratorTester.class, "testIteratorUnknownOrder"),
                Helpers.getMethod(MultisetIteratorTester.class, "testRemovingIteratorKnownOrder"),
                Helpers.getMethod(MultisetIteratorTester.class, "testRemovingIteratorUnknownOrder"));
    }
}
